Bag with insoluble automatic fold closing



A. RAMBOL D BAG WITH INSOLUBLE AUTOMATIC FOLD CLOSING Filed May 3, 1940 2 Sheets-Sheet 1 Oct. 15, 1946. A. RAMBOLD BAG WITH INSOLUBLE AUTOMATIC FOLD CLOSING Fn e ua 3, 1940 2 Sheets-Sheet 2 Patented Oct. 15, 1946 BAG WITH INSQLUBLE AUTOMATIC FOLD i o osmq r Adolf Rambold, Dresden, Germany; vested in the 3 Alien Property Custodian I Application May .3, 1940,. Serial No. 333,243 r r s I' In Germany May 30,1939

2 Claims. (Cl. 229-53) angular portions, it is necessary to locate the bottom edge portions which project beyond the base area proper between the side edges in such a mannerthat the edges of the projecting bottom edge portions are retained near the longitudinal side edges of the blank of material andare folded therewith. Bags formed inthis way, the folded seams of whichfare produced in the manner described, are completely tight. However, it is necessary to positively secure these folded seams in position, either by means of stapling with metal staples or by means of sealing the material, as

for example, the sealingof waxed paper through the'japplication of heat,'or by means of glue. The object of the present invention is to eliminate the necessity of all suchmethods of sealing,

Heretofore it has been known that asewn bag of cloth may be turned inside out after sewing in order to improve its appearance. My invention provides for improved appearance in a bag which is held together as a result of folding and without any additional aids.

My invention substantially simplies methods heretofore known. The procedure of the present invention comprises forming the bag and its side closing folds over a core, and then turning the bag inside out. A hollow core is preferably utilized which makes it possible to form the bag in a single operation by folding the blank of material on the outside around the hollow core, and then pulling the bottom of the bag through the hollow core by, means of a plunger which is ap plied to the bottom, so as to turn the bag inside out. Th projecting triangular tabs formed in the folding of the side folds must be turned down upon the bottom of the bag before the bag is turned inside out, so that the tabs are brought into the inside of the bag by the turning inside out of the bag. As a result that the bag remains completely self-closed without any additional aids beyond its folded side seams. It will be seen that the projecting bottom tabs being positioned between the continuous sides. and being folded the stapling.

. 2 r i therewith, the turning inside out causes the triangular portion connecting the folded bottom portion with the bottom to be turned on the outside, thereby securing the longitudinal side folded seam closed at th lower end of the bag. a

The bag is'particularly intended for use preferablyas an infusion bag for tea, coffee and so'forth but other uses will'readily "suggest themselves. Such bags can be used as sales packages as well as infusion bags. For the latter purpose the bags may be made for example of a suitable'material, such asfilter paper or perforated Cellophane or cloth; The top closing of said bags canbe effected in known manner by-meansof folding and clamping with staples orby meansof sealing] the material. In thecase of infusion 'bags,astring holder witha tag is applied simultaneously with The position of thefolded seamsbears'no rela-' tion to the inventionand may be arranged as desired. p Two examples are shown in their individual steps of development in the accompanying draw ings; Figures 1, 2, 3 and fare perspectivefillustrations showing the progressivefsteps in the'manufacture of the bag out of a rectangular blank sheet of material overa core of rectangular cross section, on the narrow sides of which side closing folds of the bag being produced are formed; whereby triangular portions result; Fig. 5 shows how the bag formed over the coreis drawn through the hollow core by means of a plunger and therebyturned; Fig. 6 illustrates on an en'- larged scale the operation step according to Fig. 5 ,wher eby the 'core and the piece of work are illustrated opened up; FigwT shows the bag formedaccording to Figs. 1 6, completed and turned inside out; Fig. 8 shows the bag according to Fig. 7, filled and provided with a top closing; Figs. 1, 9, 10 and 11 illustrate the progressive steps in the forming of a bag with a differently formed side edge folding; Fig. 12 shows a further method of forming the top closure for a bag; Fig. 13 shows the finished bag turned inside out, made according to Figs. 1', 9, 10, 11, 5 and 12; and Fig. 14 illustrates the bag of Fig. 13 filled and provided with a top closing.

The bags according to Figs. 8 and 14 are illustrated, for example, as infusion bags, but they may also be used as sales packages as well. The ratio of their dimensions may be as desired and the drawings are not intended to limit my invention either as to proportions or sizes. In

manufacturing the bag, as illustrated by Fig. 1,

scribed. The bottom of the bag is indicated by.

reference numeral 2. Additional portions of the bag extending from the bottom and projecting beyond the narrow sides of th core I are indicated by reference numerals 3 and 4, whereas the portions of the blank of material turned downward are indicated by and 6. The edges of the U-shaped folded blank of material (Fig.

1) are pressed together on both opposite sides and in such a manner that th lateral portions 9 and I0, extend in from; the center plane of the core, and project from the edges 1 and 8 ofthe core parallel to the sides 5 and 6 (Fig. 2). Said lateral portions 9 and In are folded together several times over and over, in the present example twice (F 3), and are folded over against the narrow side of the core I. As Fig. 3 also shows, the tabs ll projecting beyond the bottom 2 are formed by this operation and they are then folded over onto the bottom as shown in Figure 4. The plunger I2 is thenmoved in the direction of the arrow toward the bottom 2, and is applied to the bottom and is thrust through the hollow core I. The finished side folds designa'ted by reference numeral 13 are thereby prevented, for example, by means of indicated springs l4 from opening during the process of drawing through. As Fig. 6 shows, the portions H, i. e. the projecting triangular tabs are brought into the inside of the bag with the result that the bag remains closed without any additional aids simply by means of its side folds.

7 shows the finished bag. Fig. 8 shows said bag after being filled and after its top has been closed in any suitable manner. A staple l5 secures the top closing and serves at the same time to fasten a holder string I6 with tag l1.

Beginning with Fig. 1, the forming of the side folds according to Fig. 9 comprises thrusting the tabs 3 and 4, projecting beyond the bottom 2, between the lateral portions 9 and In in such a manner that the edges l8 of the tabs are retained near the longitudinal edges of said lateral portions so that when said lateral portions 9 and I0 are folded several times, said tabe 3 and 4 are folded therewith, as shown in Fig. 1. In the present example the fold is effected twice. The finished folded bag thus formed is shown in Fig. 11. The folds are indicated herein by reference numeral l9. With the tabs 3 and 4 thrust between the lateral portions 9 and I0 and folded therewith as described immediately above, the turning inside out illustrated in Fig. 5 results in the triangular portion 2!], connecting said folded bottom portions with the bottom, being positioned on the outside on both sides,- as shown clearly in Fig. 13. This secures the longitudinal side folded seam l9 in position at the lower end of the bag. It is also important that the edge 2| of the fold l9, which, as is shown in Fig. 11, is on the outer edge, be brought to the inside, whereas the inner folded edge 22 located in the middle is turned on the outside and is retained in the middle of the finished bag for locating in respect to the edges I and 8 of the core I and in closing the bag, as Fig. 14 shows, is brought further toward the inside.

The top closing-usually a fold closing-can be sealed or stapled in known manner. The top closing also serves to increase the securing of the side. folds for which gluing or stapling have heertofore been required.

While I have described my invention in certain preferred embodiments, I desire that it be understood that modifications of my invention may be readily made and I intend no limitations upon my invention other than may be imposed by the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is as follows:

1. An open bag of polygonal cross section formed from a rectangular blank of paper-like material having a smooth continuous bottom and at least two smooth continuous sides as well as two opposite continuous sides with side edges folded over and over, whereby the original edges of the material are covered by the edge of the fold and folded projecting tabs are formed, the bag being turned inside out to dispose the said folds and the tabs on the inside of the bag Whereby the foIds and tabs are prevented from unfolding, the folds and tabs being devoid of other securing means.

2 A bag of polygonal cross section formed from a rectangular blank of paper-like material having a smooth continuous bottom and at least two smooth continuous sides as well as two 01')- posite continuous sides with side edges folded over and over, whereby the original edges of dispose the said side folds and tabs on the inside Of the bag.

' ADOLF 

